Media Remoting: Add RemotingController.

third_party/WebKit/public/platform/WebMediaPlayer.h

Index: third_party/WebKit/public/platform/WebMediaPlayer.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayer.h b/third_party/WebKit/public/platform/WebMediaPlayer.h
index bb0998f9c9cb376e13f37ffa9e76391449b1583a..66b066566d5e2037ded74c5792c5cdf010d4ac2d 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayer.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayer.h
@@ -197,6 +197,10 @@ public:
     virtual void enteredFullscreen() { }
     virtual void exitedFullscreen() { }
 
+    // These are called when any ancestor enters/exits full screen.
+    virtual void ancestorEnteredFullscreen() {}
+    virtual void ancestorExitedFullscreen() {}

[xhwang, 2016/10/01 07:12:15]

See my previous comment on this. What if there are other elements sharing the
same ancestor with the media element?

You need someone who's more familiar with blink/elements/fullscreen to review
this.

[xjz, 2016/10/03 22:31:09]

Only one video element can start remoting successfully at one time. The current
logic is the first come first serve. We may improve this logic in future change.

[xhwang, 2016/10/04 06:30:29]

Could you put this comment somewhere in the code? Just in case people may ask
again.

[xjz, 2016/10/04 19:21:28]

Done.

+
     virtual void enabledAudioTracksChanged(const WebVector<TrackId>& enabledTrackIds) { }
     // |selectedTrackId| is null if no track is selected.
     virtual void selectedVideoTrackChanged(TrackId* selectedTrackId) { }